int = LineIndex(lineNo)
Retrieves the character index of a line within a multiple-line edit control.
Parameters
lineNo=-1 : int
Contains the index value for the desired line in the text
of the edit control, or contains -1. If -1, then it specifies the current line.
Comments
This method only works on multi-linr edit controls.
MFC References
CRichEditCtrl::LineIndex
Return Value
The character index of the line specified in lineNo, or -1 if
the specified line number is greater then the number of lines in
the edit control.